P.Q. At The Clavier?

After doing some research about "P.Q. at the Clavier" I now know that Wallace Stevens has created an ambiguous scene, in which the reader is being exposed to a musical piece/concerto on the surface and the biblical story of Susannah beneath it. Or maybe it's the other way around.

As far as my analytical skills can take me right now, that's it. But, as a student who appreciates poetry I can make a list of instinctive emotions/thoughts this poem brings forth to me:

• Beauty
• Lust
• Forbidden
• Longing
• Melodic Chaos
• Each Moment's Infinitenes
• Nature
• Background Music
• Death
• Praise

Who are these "red-eyed elders" and why are they spying on the naked Susannah? It is obvious this poem is hugely influenced by the theme of 'lust', made apparent by the lines,

The basses of their beings throb

In witching chords, and their thin blood

Pulse pizzicati of Hosanna.

As this poem progresses, it is accompanied by background music, such as the "Pulse pizzicati of Hosanna." The definition of Pizzicati is a method of playing bowed instruments by plucking the strings with the fingers rather than using the bow. In this case, I imagine a group of dirty, aroused old men, hiding behind a rock or tree as they watch the beautiful Susannah bathe naked, and all the while, the plucking of a cello sounds out as if to set the stage for whatever is yet to come.